Recording and measuring instrument



July 10, 1956 J. E. BEVINS ET AL 2,754,069

RECORDING AND MEASURING INSTRUMENT Original Filed April 16, 1945 2 Sheets-Sheet l INVENTORS JAMES E. BEVINS BY ROBERT W. HYDE y 10, 1956 J. E. BEVINS ET AL RECORDING AND MEASURING INSTRUMENT Original Filed April 16, 1945 2 Sheets-Sheet 2 FEET! IT' u. &

INVENTORS JAMES E.BEV|N$ BY ROBERT W- HYDE United States atent 2,754,069 RECORDING AND MEASURING INSTRUMENT James E. Bevins, Ramsey, and Robert W. Hyde, Eaglewood, N. J., assignors to Bendix Aviation Corporation, Teterhoro, N. J., a corporation of Delaware 1 Claim. (Cl. 242-55) This application is a division of application Serial No. 588,609, filed April 16, 1945, now Patent No. 2,551,866.

This invention relates to new and useful improvements in recor g instruments of the type including a tape supply roll, and motor drive mechanism for unreeling the tape from the supply roll and drawing it through printing mechanism for effecting a visible record upon the tape. More particularly it is concerned with an irreversible slip clutch device in such drive mechanism, whereby the latter is elfective to unreel the tape from the supply roll and carry it in only one direction.

A further feature of the invention is manually operable drive mechanism for effecting a slipping action of the clutch device and movement of the tape independently of the motor drive mechanism.

The foregoing and other objects and advantages of the invention will appear more fully hereinafter from a consideration of the detailed description which follows, tar-en together with the accompanying drawings wherein an embodiment of the invention is illustrated. it is to be expr ssly understood, however, that the drawings are for purposes of illustration and description only, and are not to be construed as defining the limits of the inven tion.

In the drawings, the instrument with Fig. 2 is a Fig. l; and

Fig. 3 is a section of an irreversible slip clutch in the tape-drive gearing.

Referring now to the drawings wherein an instrument embodying the invention is disclosed, at the front of the instrument is a horizontally disposed roll 44 carrying a supply of record receiving chart or tape 35. The tape is threaded upwardly over an idle roller 121 (Fig. 2) and through suitable print effecting mechanisr generally designated iii, to a tape drive roller generally designated 56. The print mechanism includes suitable type or markers 66, an inked ribbon 59 intermediately of the markers and the tape, and a platen 67 disposed rearwardly of the tape and biased toward said tape by springs ss. The platen is operatively conn cted in suitable manner to a drive motor as so as to periodically move sharply against the tape to effect, through engagement of the tape with the ribbon, and the latter against the markers, a visible record or print mark upon the tape.

The tape is unreeled from the supply roll and drawn through the print mechanism by the drive roller 55. The latter carries at opposite ends pinwheel elements 124 and 133, the pins 122 of which engage successively in perforations, formed in the marginal edges of the tape, causing the latter to unreel from the supply roll as the drive roller rotates.

The supply roll 44 is slipped at one end on a stud 3112 fixed in the framework it; of the instrument. A friction drag is provided at the opposite end of the roll by means of a spring 113 acting against a grooved hub lid which turns with the tape supply roll, the hub being Fig. 1 is a front elevational view of its cover removed; vertical section taken on the lines 2-2 of 2,754,059 Fatented July 10', 1956 rotatably mounted on a lever which is pivotally mounted on a pin 116 held in the framework 48. L5 is also connected with the framework by a tension spring 1117 (Fig. 2) which biases lever 115 against a stop portion 118 of the framework. As shown in Fig. I, screw adjustment means I89 is provided on the framere horizontal alignment of the tape supply 56 comprises a supporting shaft latter carries the hubs of the pinwheel memnd 133 at opposite ends and a plurality of s 1253 over which the tape is drawn as drive t The drive roller is driven at a constant speed ontrol gearing 46, an irreversible slip clutch arrangement generally designated 76 (Fig. 3), and gearing -5-6 to the drive roller. The slip clutch permits the drive roller to turn in only one direction.

The slip clutch includes a driving gear member 11 which is operatively connected to gearing 46. Spring pawls i2 3 mounted on a face of slip clutch gear member frictionally engage in ratchet recesses 3.29 formed in an opposed end face of a hub The latter is engaged by gearing 16 with the tape drive roller 56, by which arrangement the latter is driveable in Only one direction.

A knob arranged at one end or" the permits manual rotation of the latter independently of the motor drive. When the drive roller is driven manually through lcnob 759 at a speed exceeding its normal speed, this motion is transmitted through the gearing 46' to he hub gear member 12?, whereby the ratchet recesses in the end face of the latter are caused to successively slip from beneath the spring pawls of the relatively slower rotating clutch drive gear ill.

Gearing 133 (Fig. l) connects the tape drive roller 56 with two friction tape re-roller members (Fig. 2), so that when drive roller is rotated either manually or by motor drive, the re-rollers rotate at the same time tape drive roller with the drive roller. Spring guides or clips 58, secured to the framework by a lever 13d, guide and hold the tape stood that the invention is not limited thereto. Various changes can be made in the design and arrangement of In recording apparatus of the character described including at one end thereof a supply roll or" marginally perforated record receiving tape of appreciable width, a rotatable shaft at the other end of the apparatus carrying pin wheel members engageable with the perforations of supply roll and drawing it past intermediately positioned print means o erable for printing a record on the tape, driving mechanism for rotating the said shaft at a constant rate of speed including drive gearing connected with a power source; a slip clutch arrangement comprising a driving clutch gear operatively engaged by the drive gearing, a plurality of spring pawls carried by a face of this clutch gear, a driven clutch gear engaged with gearing carried by the rotatable shaft for driving the latter, the driven clutch gear having ratchet recesses in a face thereof in which recesses the said spring pawls are frictionally engaged, as a result of which slip clutch arrangement the driven clutch gear is driveable in only one direction by the driving clutch gear, and whereby the ratchet recesses the face of the driven clutch gear are caused to be successively slipped from beneath the spring pawls when the driven clutch member is caused to rotate at a speedexceeding that of the driving clutch gear, the

rotatable shaft including means'for'rotating the same in- References Cited in the file of this patent UNITED STATES PATENTS 21,234 Jackson Aug. 17, 1858 446,886 Pusey Feb. 24, 1891 637,853 Cowles Nov. 28, 1899 1,081,933 Waring Dec. 16, 1913 1,114,494 Little Oct. 20, 1914 1,310,195 Lockwood July 15, 1919 1,490,536 Neth Apr. 15, 1924 4 Cheesrnan Nov. 11, Myers Apr. 10, Foster Oct. 2, Darnerell June 30, Reeves Dec. 15, Fuller Mar. 21, Eccles Feb. 20, Sprenger et al. Apr. 27, Ferris Aug. 20, Mueller Jan. 6, Arey Apr. 21, Metzner Feb. 2, Holliday Mar. 2, Heist June 30, Johnson Ian. 22, Gallagher May 21, Bevins et al. May 8, 

